基于群空泡统计的螺旋桨空化噪声谱特性研究

Propeller Cavitation Noise Spectrum Feature Based on Statistics of Mass-bubble Cavitation

基于数理统计的方法,从群空泡崩溃的统计特性出发,推导并数值分析了螺旋桨群空泡崩溃辐射能量谱特点,研究了空泡群中空泡个数、空泡平均最大半径、空泡半径分布方差、环境压力等参数对空化噪声能量谱影响,给出了高频段螺旋桨空化噪声能量谱的近似表达式。结果表明,螺旋桨空化噪声谱峰值频率以上的能量与空泡半径的三次方和空泡个数的乘积成正比,即与发生崩溃的空泡总体积成正比。

Based on the mathematical statistics method and the statistics of mass-bubble cavitation collapse, the feature of propeller cavitation noise spectrum which is radiated from mass-bubble cavitation collapse is derived and numerical analyzed. The influence of bubble number, the average of the largest bubble radius, the variance of the largest bubble radius, environment pressure and so on to cavitation noisespectrum is studied. The nearest expression of cavitation noise spectrum in high frequency is pro-posed. It shows that, the energy of propeller cavitation noise spectrum above peak frequency is in proportion to the product of three cubed bubble radius and bubble number. Also it is proportable to total bubble volume that collapsed.